RELATED PARTY TRANSACTIONS - Summary of Amounts Included in Condensed Consolidated Statements of Operations Related to Fee for Service Arrangement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Equity in earnings from unconsolidated affiliates	$ 12	$ 13	$ 10
Commissions and other fees	3,978	3,835	2,335
Related Party
Related Party Transaction [Line Items]
Equity in earnings from unconsolidated affiliates	12	13	10
Commissions and other fees	$ 204	$ 200	$ 105